NXP Semiconductors MC9S08GT8AMFCE

Overview

MC9S08GT8AMFCE from NXP (formerly Freescale) is an 8-bit HCS08 microcontroller with 8 KB flash, 512 B RAM, 40-MHz CPU, and integrated peripherals including dual SCI, SPI, I²C, 10-bit ATD, and dual TPM timer/PWM modules. It operates from 1.8–3.6 V and supports three low-power stop modes. It is used in cost-sensitive industrial control and sensor interface applications requiring deterministic real-time response.

For engineers reviewing the MC9S08GT8AMFCE datasheet, MC9S08GT8AMFCE pinout, MC9S08GT8AMFCE application, or MC9S08GT8AMFCE equivalent, key selection criteria include flash size vs. GT16A, 32-pin QFN package compatibility, internal FLL clocking with ±0.5% accuracy over voltage/temperature, and background debug support via single-wire BKGD interface.

Technical Context

The MC9S08GT8AMFCE implements the HCS08 CPU core with HC08 instruction set plus BGND, supporting up to 32 interrupt/reset sources. Its internal clock generator uses a frequency-locked loop (FLL) with selectable sources: internal RC, external crystal (32 kHz–4 MHz), or external clock - enabling bus frequencies up to 20 MHz.

Peripherals include two serial communication interfaces (SCI1/SCI2), one SPI module, one I²C bus module, an 8-channel 10-bit analog-to-digital converter (ATD), and two timer/PWM modules (TPM1 with 3 channels, TPM2 with 2 channels). All I/O ports support software-selectable pullups and high-current drive (20 mA) on eight pins.

Key Specifications

Pinout & Package

MC9S08GT8AMFCE is housed in a 32-pin QFN (5 × 5 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per the MC9S08GT16A/GT8A datasheet Rev. 1 (2006), Section 2.2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with MC9S08GT16AMFCE, the MC9S08GT8AMFCE trades half the flash and RAM for lower unit cost and reduced code footprint - ideal for fixed-function controllers where firmware size is stable. Versus S9KEAZ128AMLH, it avoids ARM toolchain complexity and delivers deterministic sub-1µs interrupt latency critical in hard real-time loops.

Availability

MC9S08GT8AMFCE is available at Aetrix Electronics and suitable for industrial sensor nodes, smart HVAC controllers, motor interface modules, and legacy equipment retrofit programs requiring stable component supply and long-term obsolescence management.

Supply support for MC9S08GT8AMFCE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor company formed from the spin-off of Freescale Semiconductor in 2015, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The HCS08 family, including MC9S08GT8AMFCE, was designed for cost-sensitive, low-power embedded control applications requiring high integration, robust debug capability, and long product lifecycle support in industrial and consumer systems.

FAQ

What is the maximum operating frequency of the MC9S08GT8AMFCE CPU core?

The MC9S08GT8AMFCE CPU core runs at a maximum frequency of 40 MHz. This is the core clock speed; the bus clock - which governs peripheral timing - is derived from the internal FLL and can be configured up to 20 MHz. The actual achievable bus frequency depends on the selected clock source (e.g., 32 kHz crystal → 4.19 MHz bus; 4 MHz crystal → 20 MHz bus) and FLL multiplication settings as defined in the ICGC1/ICGC2 registers.

Does the MC9S08GT8AMFCE support in-circuit debugging, and what interface is used?

Yes, the MC9S08GT8AMFCE supports full in-circuit debugging via its single-wire background debug (BKGD) interface on PTG0. This interface enables breakpoint setting, real-time bus capture using an 8-deep FIFO, and on-chip ICE functionality - all without requiring a dedicated JTAG header. The MC9S08GT8AMFCE does not require external debug probes beyond standard BDM-compatible tools, and the BKGD pin doubles as mode-select during reset for flexible boot configuration.

What are the power supply requirements for the MC9S08GT8AMFCE, and how is analog/digital isolation handled?

The MC9S08GT8AMFCE requires two separate supply domains: VDD/VSS (1.8–3.6 V) for digital logic and VDDAD/VSSAD (same voltage range) for analog circuits including the ATD and internal bandgap reference. Although supplied from the same rail in most designs, the datasheet mandates separate PCB routing and local decoupling (0.1 µF ceramic + 1–10 µF bulk) for VDDAD to minimize noise coupling into the 10-bit ADC. The internal voltage regulator ensures stable analog reference even under digital switching transients.

Can the MC9S08GT8AMFCE generate PWM signals, and how many independent channels are available?

Yes, the MC9S08GT8AMFCE integrates two Timer/PWM (TPM) modules: TPM1 with three independent channels and TPM2 with two independent channels - totaling five PWM-capable outputs. Each channel supports edge-aligned, center-aligned, and input-capture modes, with programmable modulo values and duty-cycle registers (TPMxCnVH:TPMxCnVL). These channels are mapped to specific port pins (e.g., PTC4–PTC6 for TPM1, PTD0–PTD2 for TPM2), and their timing is synchronized to the bus clock for precise phase relationships in motor control or lighting applications.

Is the MC9S08GT8AMFCE pin-compatible with other devices in the GT series, and which packages share the same footprint?

Yes, the MC9S08GT8AMFCE in the 32-pin QFN package (MFCE suffix) is pin-compatible with the MC9S08GT16AMFCE and MC9S08GT32AMFCE in the same package variant. All share identical pin assignments, electrical characteristics, and peripheral mappings - differing only in flash/RAM capacity and associated security lock bits. This allows hardware reuse across product tiers; firmware must be sized to fit the target device's memory, but no PCB redesign is needed when upgrading from MC9S08GT8AMFCE to MC9S08GT16AMFCE.